The intrinsic miniaturization capabilities of fractal geometries are applied in this work to design a reduced size reflectarray unit cell, potentially offering the ability to focalize the reflected field along very wide angles off-broadside. A Minkowski fractal shaped patch is proposed as reflectarray radiator, with a properly fixed reduced side length and a variable scaling factor as phase tuning parameter. The proposed approach is applied to design a X-band 0.3λ×0.3λ fractal reflectarray cell giving a 320° phase agility. A reflectarray prototype of 15x15 radiators is considered as validation example, and the measured radiation patterns are reported to demonstrate the reflectarray capability to point the main lobe at a wide direction off-broadside, equal to 50°.
MINIATURIZED FRACTAL-SHAPED REFLECTARRAYS FOR WIDEANGLE FIXED-BEAM APPLICATIONS
Costanzo S;VENNERI, FRANCESCA
2014-01-01
Abstract
The intrinsic miniaturization capabilities of fractal geometries are applied in this work to design a reduced size reflectarray unit cell, potentially offering the ability to focalize the reflected field along very wide angles off-broadside. A Minkowski fractal shaped patch is proposed as reflectarray radiator, with a properly fixed reduced side length and a variable scaling factor as phase tuning parameter. The proposed approach is applied to design a X-band 0.3λ×0.3λ fractal reflectarray cell giving a 320° phase agility. A reflectarray prototype of 15x15 radiators is considered as validation example, and the measured radiation patterns are reported to demonstrate the reflectarray capability to point the main lobe at a wide direction off-broadside, equal to 50°.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
